#5B5FA9
Closest named color: French Blue (#436BAD). oklch(51.7% 0.116 279.2), rgb(91, 95, 169).
Aa
White text reads best on this color (5.74:1).
About this color
#5B5FA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.116 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.041 away. White text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.65:1 |
| White text | 5.74:1 |
Values
| HEX | #5B5FA9 |
| RGB | rgb(91, 95, 169) |
| HSL | hsl(237, 31%, 51%) |
| OKLCH | oklch(51.7% 0.116 279.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5B5FA9 | 5.74:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #5B5FA9 | 3.65:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #5B5FA9 text on white | 5.74:1 | AA | Lc 78.6 | Fine for body text |
| #5B5FA9 text on black | 3.65:1 | AA large text | Lc -23.2 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EE
oklch(88.4% 0.032 279.8)
-
Step 300
300
#B8BDE5
oklch(80.8% 0.057 279.5)
-
Step 400
400
#949BD8
oklch(70.7% 0.089 278.8)
-
Step 500
500
#7B81CD
oklch(63% 0.114 279.2)
-
Step 600
600
#6569BA
oklch(55.5% 0.124 279.4)
-
Step 700
700 (this color)
#5B5FA9
oklch(51.7% 0.116 279.2)
-
Step 800
800
#454882
oklch(42.8% 0.095 279.3)
-
Step 900
900
#393D68
oklch(37.7% 0.073 278.2)
-
Step 950
950
#22243D
oklch(27.1% 0.046 279.3)
#5B5FA9 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #4269AC | 0.038 |
| Deuteranopia (no green cones) | #3D63A7 | 0.038 |
| Tritanopia (no blue cones) | #406E7C | 0.100 |
| Achromatopsia (no color) | #666666 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5FA9
#5B5FA9
oklch(51.7% 0.116 279.2)
- #786800
#786800
oklch(51.7% 0.107 98.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5B5FA9, closest first.
No curated palette has a color within ΔE 0.04 of #5B5FA9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.041
- Dusky Blue #475F94 ΔE 0.045
- Iris #6258C4 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.059
- Twilight #4E518B ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.063
- Slate Blue #6A5ACD ΔE 0.063
Use #5B5FA9 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.